12=9-3v

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Solution for 12=9-3v equation: 



12=9-3v

We move all terms to the left:

12-(9-3v)=0

We add all the numbers together, and all the variables

-(-3v+9)+12=0

We get rid of parentheses

3v-9+12=0

We add all the numbers together, and all the variables

3v+3=0

We move all terms containing v to the left, all other terms to the right

3v=-3

v=-3/3

v=-1

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